The Sweet Peep Series video baby monitors has a Voice Trigger (VOX) mode that allows the battery in your monitor to last longer. VOX mode keeps the monitor screen and speaker off, unless sound is heard from the camera at a pre-selected sensitivity level. If you are experiencing no sound in VOX mode, increase the sensitivity on your monitor.
IMPORTANT: VOX mode will not work while your monitor is in Scan mode.
To adjust audio sensitivity in VOX mode:
Using the video monitor, press the menu button until VOX is shown.
Press the volume up / down buttons to adjust audio sensitivity.